According to a story published on the Journal website late Friday, the Federal Bureau of Investigation and the Securities and Exchange Commission are probing whether Mickelson and Walters illegally traded on nonpublic information they allegedly obtained from Icahn about his investments in public companies. The Journal story attributed the information to “people briefed on the probe.”

The feds are said to be investigating whether the past three years Icahn illegally provided Walters — well known in Vegas for his sports-betting abilities — about potentially market-moving investments by Icahn’s company, Icahn Enterprises, the Journal story said.

From Huffington Post

Federal investigators are looking into whether Mickelson and Walters may have traded illegally on private information provided by Icahn about his investments in public corporations, the source told Reuters, confirming a report by the Wall Street Journal on Friday.